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Dermatomes/Myotomes

Skin surfaces and Muscles weakness

Nerve RootDermatomeMuscles to test (Myotome)Muscle test
C1 Vertex of skull None None
C2 Temple,forehead ,occiput Longus colli, SCM, rectus capitis Shoulder shrug
C3 Entire neck, posterior cheek, temporal area, prolongation forward under mandible Trapezius, splenius capitis Shoulder shrug
C4 Shoulder area, clavicular area, upper scapular area Trapezius, levator scapulae Shoulder shrug
C5 Deltoid area, anterior aspect of entire arm to base of thumb Supraspinatus, infraspinatus, deltoid, biceps Elbow flexion
C6 Anterior arm, radial side of hand to thumb and index finger Biceps, supinator, wrist extensors Elbow flexion; radial wrist extension
C7 Lateral arm and forearm to index, long, and ring fingers Triceps, wrist flexors Wrist flexion
C8 Medial arm and forearm to long, ring, and little finger Ulnar deviation, thumb extensors, thumb adductors Thumb extension
T1 Medial side of forearm to base of little finger N/A Abduct fifth digit
T2 Medial side of upper arm to medial elbow, pectoral and midscapular areas N/A N/A
T3-T6 Upper thorax N/A N/A
T5-T7 Costal margin N/A N/A
T8-T12 Abdomen and lumbar region N/A N/A
L1 Back, over trochanter and groin None Hip flexion
L2 Back, front of thigh to knee Psoas, hip adductors Hip flexion
L3 Back, upper buttock, anterior thigh and knee, medial lower leg Psoas, quadriceps, thigh atrophy Hip flexion; knee extension
L4 Medial buttock, lateral thigh, medial leg, dorsum of foot, big toe Tibialis anterior, extensor hallucis Knee extension; ankle dorsiflexion
L5 Buttock, posterior and lateral thigh, lateral aspect of leg, dorsum of foot, medial half of sole, first, second, and third toes Extensor hallucis, peroneals, gluteus medius, dorsiflexors, hamstring and calf atrophy Ankle dorsiflexion; extend great toe; knee flexion
S1 Buttock, thigh and leg posterior Calf and hamstring, wasting of gluteals, peroneals, plantar flexors Knee flexion; ankle plantar flexion
S2 (S1 for dermatome) Buttocks, thigh and leg posterior (one of two popssible answers) Calf and hamstring, wasting of gluteals, plantarflexors, not peroneals Ankle plantar flexion
S3 Groin, medial thigh to knee None None
S4 Perinuem, genitals, lower sacrum Bladder, rectum None
Created by: sueswes@aol.com
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